Ciao Marco, I just looked the classification of the coloration "pyle". There is mentioned for frequently appearing errors : "lacking of the wing triangle, too pale colour on the shoulders, neck and saddle. Also too red animals, which especially becomes visible in the chest but also on the rest of the plumage . Sometimes black dots and spots".
So go on with the best painted subjects and do selection.
What you intended with : "(that the part that should be white is grey)"
Only a detail but what you mentioned as "salmon red" on the chest of the cocks, you must look good in detail comparison cock and hen next to eachother , than you should she it is not the same as on the chest of the hen, this because "salmon red" is only on the chests of hens (e+/e+ = selvatica) that on the chests of the cocks is diluted red-pigment.